Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Heat transfer coefficients for steam and hot water coils submerged in oil tanks.
overall heat transfer coefficients for steam coils with medium pressure - or hot water coils or pipes - submerged in oil or fat:
Submerged Coils - Heat Transfer Coefficients Type of Coil Heat Transfer Coefficient - U - (W/m 2 oC) (Btu/hr ft 2 oF) Steam to Aqueous Solutions, agitated 800 - 1200 140 - 210 Steam to Aqueous Solutions, natural convection 340 - 570 60 - 100 Steam to Light Oil, natural convection 170 30 Steam to Heavy Oil, natural convection 85 - 115 15 - 20 Steam to Heavy Oil, agitated 140 - 310 25 - 55 Steam to Fat, natural convection 30 - 60 5 - 10 Steam to Organics, agitated 510 - 800 90 - 140 Hot Water to Oil, natural convection 34 - 140 6 - 25 Hot Water to Water, natural convection 200 - 370 35 - 65 Hot Water to Water, agitated 480 - 850 90 - 150 Heat transfer oil to Organics, agitated 140 - 280 25 - 50 Salt brine to Water, agitated 280 - 630 50 - 110 Cooling Water to Glycerine, agitated 280 - 430 50 - 75 Example - Heat Transfer from a Steam Coil
steam coil with outside diameter 50 mm 60.3 mm(0.0603 m) and length 10 m with is submerged in an oil bath with temperature 1 bar absolute pressure and steam temperature 120 oC 50 . oC
The surface area of the coil can be calculated by multiplying the pipe circumference with pipe length as
A = π (0.0603 m) (10 m)
= 1.89 m 2
From the table above the heat transfer coefficient is
170 W/m for "Steam to Light Oil, Natural Convection". The heat transfer can be calculated as 2 oC
Q = (1.89 m 2)((120 oC) - (50 oC))(170 W/m 2 oC)
= 22491 W
Related Topics Heat loss from pipes, tubes and tanks - with and without insulation - foam, fiberglass, rockwool and more. Related Documents Arithmetic Mean Temperature Difference in Heat Exchangers - AMTD - and Logarithmic Mean Temperature Difference - LMTD - formulas with examples - Online Mean Temperature Calculator. Heat transfer when steam condensates. Overall heat transfer coefficients in common heat exchanger designs - tubular, plate or spiral. Average overall heat transmission coefficients for fluid and surface combinations like Water to Air, Water to Water, Air to Air, Steam to Water and more. Heat loss from insulated and uninsulated, sheltered and exposed heated oil tanks. Heat loss from lagged and unlagged, sheltered and exposed oil tanks. Walls or heat exchangers - calculate overall heat transfer coefficients. Heat emission from steam or water heating pipes submerged in oil or fat - forced and natural circulation. Heat emision from steam or water heating pipes submerged in water - assisted (forced) or natural circulation. Calculating the amount of steam in non-flow batch and continuous flow heating processes. Search
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